Expanding the Boundary of Water-Tolerant Frustrated Lewis Pair Hydrogenation: Enhanced Back Strain in the Lewis Acid Enables the Reductive Amination of Carbonyls

The development of a boron/nitrogen-centered frustrated Lewis pair (FLP) with remarkably high water tolerance is presented. As systematic steric tuning of the boron-based Lewis acid (LA) component revealed, the enhanced back-strain makes water binding increasingly reversible in the presence of relatively strong base. This advance allows the limits of FLP's hydrogenation to be expanded, as demonstrated by the FLP reductive amination of carbonyls. This metal-free catalytic variant displays a notably broad chemo-selectivity and generality

ICT Solutions Supporting the Collection of Municipal Waste

Celem artykułu jest prezentacja korzyści wynikających z wdrożonego rozwiązania technologii mobilnej mającej na celu wspomaganie selektywnej zbiórki odpadów na terenach gmin. Przedstawiono aktualne obowiązki gmin w zakresie gospodarki odpadami skategoryzowane w ramach realizowanych funkcji wynikających z ustawy o utrzymaniu czystości i porządku w gminach. Zaprezentowano rozwiązania w zakresie organizacji zbiórki odpadów, edukacji społeczeństwa, przekazywania informacji i realizacji działań kontrolnych. Zidentyfikowane zostały mankamenty funkcjonujących obecnie systemów zbiórki odpadów komunalnych i na ich podstawie wskazano proponowane rozwiązanie występujących problemów przy wykorzystaniu technologii informacyjnych. Artykuł jest elementem prac, których podstawowym celem jest poprawa efektywności funkcjonowania systemów zbiórki odpadów komunalnych organizowanych przez gminy znajdujące się na terenie Polski.The aim of the paper is to present the benefits of the application of ICT solution in the collection of municipal waste. In the first part of paper the current responsibilities of municipalities in waste management are presented. Then the main ways of waste collection system design are discussed. Based on our empirical studies we identified the solution of currently functioning municipal was collection system and their disadvantages. In the last part of paper the description of “kiedywywoz.pl” project is briefly given. The presented research are the first step of works whose primary purpose is to improve the efficiency of the systems municipal waste collection organized by the municipalities located on Polish territory

Cationic palladium(II), platinum(II) and ruthenium(II) complexes containing a chelating difluoro-substituted thiourea ligand

The fluorine substituted thiourea 2,6-F2C6H3C(O)NHC(S)NEt2 was prepared in good yield from the reaction of 2,6-F2C6H3C(O)Cl with KSCN and Et2NH in acetone. Using this compound several heteroleptic, monocationic Pd(II), Pt(II) and Ru(II) complexes of the type cis-[M{κ2S,O-2,6-F2C6H3C(O)NC(S)NEt2}(L)]PF6 [M = Pt, Pd; L = (Ph3P)2, tBu2bipy, 1,10-phen] as well as [Ru(η6-p-cym){κ2S,O-2,6-F2C6H3C(O)NC(S)NEt2}(PPh3)]PF6 were prepared in high yields. The compounds were characterised by spectroscopic methods and, in one case, by single crystal X-ray diffraction

Synthesis of Nickel Nanoparticles with N-Doped Graphene Shells for Catalytic Reduction Reactions

The synthesis of novel nanoparticles is of general importance for the development of efficient heterogeneous catalysts. Herein, the preparation of carbon-supported nickel-based nanoparticles (NPs), modified by nitrogen-doped graphene layers, is reported for the first time. The resulting materials were characterized in detail by TEM, X-ray photoelectron spectroscopy (XPS), XRD, elemental analysis (EA), electron paramagnetic resonance (EPR), temperature-programmed reduction (TPR), BET, and Raman analysis. Initial catalytic tests revealed the potential of this class of compounds in hydrogenation reactions

Highly Chemoselective Metal-Free Reduction of Phosphine Oxides to Phosphines

Unprecedented chemoselective reductions of phosphine oxides to phosphines proceed smoothly in the presence of catalytic amounts of specific Brønsted acids. By utilizing inexpensive silanes, e.g., PMHS or (EtO)₂MeSiH, other reducible functional groups such as ketones, aldehydes, olefins, nitriles, and esters are well-tolerated under optimized conditions

1-Benzoyl-3-methyl-3-pentylthiourea

Two independent molecules comprise the asymmetric unit of the title compound, C14H20N2OS. These differ in the relative orientations of the pentyl chains [C—C—C—C torsion angles = −176.7 (3) and 176.4 (3)°]. Significant twists are evident in each molecule, the dihedral angles formed between the thiourea and amide residues being 53.47 (17) and 55.81 (17)°. In the crystal, each molecule self-associates via a centrosymmetric eight-membered {...HNC=S}2 synthon, and these are connected into a supramolecular chain along [110] via C—H...O contacts. Disorder is noted for one of the independent molecules in that two orientations (50:50) were resolved for its benzene ring